Reed's RCORP smooth jaw wrench fits up to 2 in corp stops and opens to a generous maximum of 4-1/2 in. A coarse adjustment thread and a large thumbscrew provide quick, easy adjustments for the numerous size changes encountered during jobs. Ford Meter Box® and A.Y. McDonald®, along with other brass fittings manufacturers, recommend a smooth jaw wrench when tightening corp stops, either into the pipe or tapping saddle, or for tightening the service line connection on any waterworks brass valve or fitting.